Skip to content
  • Categories
  • Recent
  • Tags
  • Popular
  • Users
  • Groups
Collapse
Brand Logo

ModalAI Forum

  1. ModalAI Support Forum
  2. General Questions
  3. FCU: Vision Failure for VIO

FCU: Vision Failure for VIO

Scheduled Pinned Locked Moved Unsolved General Questions
2 Posts 1 Posters 500 Views
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • S Offline
    S Offline
    SMRazaRizvi
    Regular
    wrote on last edited by
    #1

    I am using the VIO on a Sentinel, and I've configured it to use the Front Stereo Left camera.

    However, I get the following error after a while when I start moving the drone.

    FCU: Vision Failure
    

    Please help.

    Important configurations:

    voxl-qvio-server.conf

    {
    	"imu_name":	"imu_apps",
    	"cam_name":	"stereo_front",
    	"lens_cal_path":	"/data/modalai/opencv_stereo_front_intrinsics.yml",
    	"cam_extrinsics_name":	"stereo_front_l",
    	"use_second_cam_if_stereo":	true,
    	"odr_hz":	10,
    	"use_camera_height_bootstrap":	true,
    	"camera_height_off_ground_m":	0.085000000894069672,
    	"enable_init_while_moving":	false,
    	"cam_imu_timeshift_s":	-0.0020000000949949026,
    	"cam_imu_timeshift_s_uncertainty":	0.0010000000474974513,
    	"T_cam_wrt_imu_uncertainty":	[0.00050000002374872565, 0.00050000002374872565, 0.00050000002374872565],
    	"R_cam_to_imu_uncertainty":	[0.00499999988824129, 0.00499999988824129, 0.00499999988824129],
    	"accl_fsr_ms2":	156,
    	"gyro_fsr_rad":	34,
    	"accl_noise_std_dev":	0.31600001454353333,
    	"gyro_noise_std_dev":	0.00999999977648258,
    	"cam_noise_std_dev":	100,
    	"min_std_pixel_noise":	0.5,
    	"fail_high_pixel_noise_points":	1.6650999784469604,
    	"limited_imu_bw_trigger":	25,
    	"gps_imu_time_alignment_s":	0,
    	"T_gps_wrt_imu":	[0, 0, 0],
    	"enable_mapping":	true,
    	"enable_gps_vel":	false,
    	"en_auto_reset":	true,
    	"auto_reset_max_velocity":	10,
    	"auto_reset_max_v_cov_instant":	0.10000000149011612,
    	"auto_reset_max_v_cov":	0.00999999977648258,
    	"auto_reset_max_v_cov_timeout_s":	0.5,
    	"auto_reset_min_features":	3,
    	"auto_reset_min_feature_timeout_s":	1,
    	"en_standby_mode":	true,
    	"standby_skip_frames":	1
    }
    

    extrinsics.conf

    {
    	"name":	"Sentinel_V1",
    	"extrinsics":	[{
    			"parent":	"imu_px4",
    			"child":	"imu_apps",
    			"T_child_wrt_parent":	[0.0256, -0.0131, 0.0],
    			"RPY_parent_to_child":	[0, 0, 0]
    		}, {
    			"parent":	"imu_apps",
    			"child":	"tracking",
    			"T_child_wrt_parent":	[0.0273, 0.0067, 0.0182],
    			"RPY_parent_to_child":	[0, 45, 90]
    		}, {
    			"parent":	"imu_apps",
    			"child":	"stereo_front_l",
    			"T_child_wrt_parent":	[-0.00463019, -0.000268, -0.0008748],
    			"RPY_parent_to_child":	[0, 0, 0]
    		}, {
    			"parent":	"imu_px4",
    			"child":	"tracking",
    			"T_child_wrt_parent":	[0.0529, -0.0064, 0.0182],
    			"RPY_parent_to_child":	[0, 45, 90]
    		}, {
    			"parent":	"body",
    			"child":	"imu_apps",
    			"T_child_wrt_parent":	[0.0583, -0.0067, -0.0360],
    			"RPY_parent_to_child":	[0, 0, 0]
    		}, {
    			"parent":	"body",
    			"child":	"imu_px4",
    			"T_child_wrt_parent":	[0.0327, 0.0084, -0.0360],
    			"RPY_parent_to_child":	[0, 0, 0]
    		}, {
    			"parent":	"body",
    			"child":	"stereo_front_l",
    			"T_child_wrt_parent":	[0.0793, -0.040, -0.0243],
    			"RPY_parent_to_child":	[0, 90, 90]
    		}, {
    			"parent":	"body",
    			"child":	"stereo_rear_l",
    			"T_child_wrt_parent":	[-0.0297, 0.04, 0.0415],
    			"RPY_parent_to_child":	[0, -90, -90]
    		}, {
    			"parent":	"body",
    			"child":	"tof",
    			"T_child_wrt_parent":	[0.078, 0, -0.025],
    			"RPY_parent_to_child":	[0, 90, 90]
    		}, {
    			"parent":	"body",
    			"child":	"ground",
    			"T_child_wrt_parent":	[0, 0, 0.058],
    			"RPY_parent_to_child":	[0, 0, 0]
    		}]
    }
    
    

    voxl-camera-server.conf

    {
    	"version":	0.1,
    	"cameras":	[{
    			"type":	"ov7251",
    			"name":	"tracking",
    			"enabled":	true,
    			"camera_id":	2,
    			"fps":	30,
    			"en_preview":	true,
    			"preview_width":	640,
    			"preview_height":	480,
    			"pre_format":	"raw8",
    			"ae_mode":	"lme_msv",
    			"ae_desired_msv":	60,
    			"ae_filter_alpha":	0.600000023841858,
    			"ae_ignore_fraction":	0.20000000298023224,
    			"ae_slope":	0.05000000074505806,
    			"ae_exposure_period":	1,
    			"ae_gain_period":	1
    		}, {
    			"type":	"imx214",
    			"name":	"hires",
    			"enabled":	true,
    			"camera_id":	3,
    			"fps":	30,
    			"en_preview":	false,
    			"preview_width":	640,
    			"preview_height":	480,
    			"pre_format":	"nv21",
    			"en_small_video":	true,
    			"small_video_width":	1024,
    			"small_video_height":	768,
    			"small_venc_mode":	"h265",
    			"small_venc_br_ctrl":	"cqp",
    			"small_venc_Qfixed":	30,
    			"small_venc_Qmin":	15,
    			"small_venc_Qmax":	40,
    			"small_venc_nPframes":	9,
    			"small_venc_mbps":	2,
    			"en_large_video":	true,
    			"large_video_width":	1024,
    			"large_video_height":	768,
    			"large_venc_mode":	"h264",
    			"large_venc_br_ctrl":	"cqp",
    			"large_venc_Qfixed":	38,
    			"large_venc_Qmin":	15,
    			"large_venc_Qmax":	50,
    			"large_venc_nPframes":	29,
    			"large_venc_mbps":	30,
    			"en_snapshot":	true,
    			"en_snapshot_width":	4160,
    			"en_snapshot_height":	3120,
    			"ae_mode":	"isp"
    		}, {
    			"type":	"ov7251",
    			"name":	"stereo_front",
    			"enabled":	true,
    			"camera_id":	0,
    			"camera_id_second":	1,
    			"independent_exposure":	false,
    			"fps":	30,
    			"en_preview":	true,
    			"preview_width":	640,
    			"preview_height":	480,
    			"pre_format":	"raw8",
    			"ae_mode":	"lme_msv",
    			"ae_desired_msv":	60,
    			"ae_filter_alpha":	0.600000023841858,
    			"ae_ignore_fraction":	0.20000000298023224,
    			"ae_slope":	0.05000000074505806,
    			"ae_exposure_period":	1,
    			"ae_gain_period":	1
    		}, {
    			"type":	"ov7251",
    			"name":	"stereo_rear",
    			"enabled":	true,
    			"camera_id":	5,
    			"camera_id_second":	4,
    			"independent_exposure":	false,
    			"fps":	30,
    			"en_preview":	true,
    			"preview_width":	640,
    			"preview_height":	480,
    			"pre_format":	"raw8",
    			"ae_mode":	"lme_msv",
    			"ae_desired_msv":	60,
    			"ae_filter_alpha":	0.600000023841858,
    			"ae_ignore_fraction":	0.20000000298023224,
    			"ae_slope":	0.05000000074505806,
    			"ae_exposure_period":	1,
    			"ae_gain_period":	1
    		}]
    }
    
    
    S 1 Reply Last reply
    0
    • S SMRazaRizvi

      I am using the VIO on a Sentinel, and I've configured it to use the Front Stereo Left camera.

      However, I get the following error after a while when I start moving the drone.

      FCU: Vision Failure
      

      Please help.

      Important configurations:

      voxl-qvio-server.conf

      {
      	"imu_name":	"imu_apps",
      	"cam_name":	"stereo_front",
      	"lens_cal_path":	"/data/modalai/opencv_stereo_front_intrinsics.yml",
      	"cam_extrinsics_name":	"stereo_front_l",
      	"use_second_cam_if_stereo":	true,
      	"odr_hz":	10,
      	"use_camera_height_bootstrap":	true,
      	"camera_height_off_ground_m":	0.085000000894069672,
      	"enable_init_while_moving":	false,
      	"cam_imu_timeshift_s":	-0.0020000000949949026,
      	"cam_imu_timeshift_s_uncertainty":	0.0010000000474974513,
      	"T_cam_wrt_imu_uncertainty":	[0.00050000002374872565, 0.00050000002374872565, 0.00050000002374872565],
      	"R_cam_to_imu_uncertainty":	[0.00499999988824129, 0.00499999988824129, 0.00499999988824129],
      	"accl_fsr_ms2":	156,
      	"gyro_fsr_rad":	34,
      	"accl_noise_std_dev":	0.31600001454353333,
      	"gyro_noise_std_dev":	0.00999999977648258,
      	"cam_noise_std_dev":	100,
      	"min_std_pixel_noise":	0.5,
      	"fail_high_pixel_noise_points":	1.6650999784469604,
      	"limited_imu_bw_trigger":	25,
      	"gps_imu_time_alignment_s":	0,
      	"T_gps_wrt_imu":	[0, 0, 0],
      	"enable_mapping":	true,
      	"enable_gps_vel":	false,
      	"en_auto_reset":	true,
      	"auto_reset_max_velocity":	10,
      	"auto_reset_max_v_cov_instant":	0.10000000149011612,
      	"auto_reset_max_v_cov":	0.00999999977648258,
      	"auto_reset_max_v_cov_timeout_s":	0.5,
      	"auto_reset_min_features":	3,
      	"auto_reset_min_feature_timeout_s":	1,
      	"en_standby_mode":	true,
      	"standby_skip_frames":	1
      }
      

      extrinsics.conf

      {
      	"name":	"Sentinel_V1",
      	"extrinsics":	[{
      			"parent":	"imu_px4",
      			"child":	"imu_apps",
      			"T_child_wrt_parent":	[0.0256, -0.0131, 0.0],
      			"RPY_parent_to_child":	[0, 0, 0]
      		}, {
      			"parent":	"imu_apps",
      			"child":	"tracking",
      			"T_child_wrt_parent":	[0.0273, 0.0067, 0.0182],
      			"RPY_parent_to_child":	[0, 45, 90]
      		}, {
      			"parent":	"imu_apps",
      			"child":	"stereo_front_l",
      			"T_child_wrt_parent":	[-0.00463019, -0.000268, -0.0008748],
      			"RPY_parent_to_child":	[0, 0, 0]
      		}, {
      			"parent":	"imu_px4",
      			"child":	"tracking",
      			"T_child_wrt_parent":	[0.0529, -0.0064, 0.0182],
      			"RPY_parent_to_child":	[0, 45, 90]
      		}, {
      			"parent":	"body",
      			"child":	"imu_apps",
      			"T_child_wrt_parent":	[0.0583, -0.0067, -0.0360],
      			"RPY_parent_to_child":	[0, 0, 0]
      		}, {
      			"parent":	"body",
      			"child":	"imu_px4",
      			"T_child_wrt_parent":	[0.0327, 0.0084, -0.0360],
      			"RPY_parent_to_child":	[0, 0, 0]
      		}, {
      			"parent":	"body",
      			"child":	"stereo_front_l",
      			"T_child_wrt_parent":	[0.0793, -0.040, -0.0243],
      			"RPY_parent_to_child":	[0, 90, 90]
      		}, {
      			"parent":	"body",
      			"child":	"stereo_rear_l",
      			"T_child_wrt_parent":	[-0.0297, 0.04, 0.0415],
      			"RPY_parent_to_child":	[0, -90, -90]
      		}, {
      			"parent":	"body",
      			"child":	"tof",
      			"T_child_wrt_parent":	[0.078, 0, -0.025],
      			"RPY_parent_to_child":	[0, 90, 90]
      		}, {
      			"parent":	"body",
      			"child":	"ground",
      			"T_child_wrt_parent":	[0, 0, 0.058],
      			"RPY_parent_to_child":	[0, 0, 0]
      		}]
      }
      
      

      voxl-camera-server.conf

      {
      	"version":	0.1,
      	"cameras":	[{
      			"type":	"ov7251",
      			"name":	"tracking",
      			"enabled":	true,
      			"camera_id":	2,
      			"fps":	30,
      			"en_preview":	true,
      			"preview_width":	640,
      			"preview_height":	480,
      			"pre_format":	"raw8",
      			"ae_mode":	"lme_msv",
      			"ae_desired_msv":	60,
      			"ae_filter_alpha":	0.600000023841858,
      			"ae_ignore_fraction":	0.20000000298023224,
      			"ae_slope":	0.05000000074505806,
      			"ae_exposure_period":	1,
      			"ae_gain_period":	1
      		}, {
      			"type":	"imx214",
      			"name":	"hires",
      			"enabled":	true,
      			"camera_id":	3,
      			"fps":	30,
      			"en_preview":	false,
      			"preview_width":	640,
      			"preview_height":	480,
      			"pre_format":	"nv21",
      			"en_small_video":	true,
      			"small_video_width":	1024,
      			"small_video_height":	768,
      			"small_venc_mode":	"h265",
      			"small_venc_br_ctrl":	"cqp",
      			"small_venc_Qfixed":	30,
      			"small_venc_Qmin":	15,
      			"small_venc_Qmax":	40,
      			"small_venc_nPframes":	9,
      			"small_venc_mbps":	2,
      			"en_large_video":	true,
      			"large_video_width":	1024,
      			"large_video_height":	768,
      			"large_venc_mode":	"h264",
      			"large_venc_br_ctrl":	"cqp",
      			"large_venc_Qfixed":	38,
      			"large_venc_Qmin":	15,
      			"large_venc_Qmax":	50,
      			"large_venc_nPframes":	29,
      			"large_venc_mbps":	30,
      			"en_snapshot":	true,
      			"en_snapshot_width":	4160,
      			"en_snapshot_height":	3120,
      			"ae_mode":	"isp"
      		}, {
      			"type":	"ov7251",
      			"name":	"stereo_front",
      			"enabled":	true,
      			"camera_id":	0,
      			"camera_id_second":	1,
      			"independent_exposure":	false,
      			"fps":	30,
      			"en_preview":	true,
      			"preview_width":	640,
      			"preview_height":	480,
      			"pre_format":	"raw8",
      			"ae_mode":	"lme_msv",
      			"ae_desired_msv":	60,
      			"ae_filter_alpha":	0.600000023841858,
      			"ae_ignore_fraction":	0.20000000298023224,
      			"ae_slope":	0.05000000074505806,
      			"ae_exposure_period":	1,
      			"ae_gain_period":	1
      		}, {
      			"type":	"ov7251",
      			"name":	"stereo_rear",
      			"enabled":	true,
      			"camera_id":	5,
      			"camera_id_second":	4,
      			"independent_exposure":	false,
      			"fps":	30,
      			"en_preview":	true,
      			"preview_width":	640,
      			"preview_height":	480,
      			"pre_format":	"raw8",
      			"ae_mode":	"lme_msv",
      			"ae_desired_msv":	60,
      			"ae_filter_alpha":	0.600000023841858,
      			"ae_ignore_fraction":	0.20000000298023224,
      			"ae_slope":	0.05000000074505806,
      			"ae_exposure_period":	1,
      			"ae_gain_period":	1
      		}]
      }
      
      
      S Offline
      S Offline
      SMRazaRizvi
      Regular
      wrote on last edited by
      #2

      @SMRazaRizvi @Moderator

      1 Reply Last reply
      0

      Reading along? Create a free ModalAI Forum account to join in.

      With an account you can reply, ask your own question, get an email when a ModalAI engineer answers, and mark the reply that solved it. Your place in each thread is saved between visits.

      Questions about VOXL, Flight Core, ESCs and ModalAI drones are answered here by the engineers who build them.

      Register Login
      Reply
      • Reply as topic
      Log in to reply
      • Oldest to Newest
      • Newest to Oldest
      • Most Votes


      ModalAI
      Categories Recent Tags ModalAI.com Docs
      © 2026 ModalAI® · Accelerating autonomy for smaller, smarter, safer drones · Powered by NodeBB
      • Login

      • Don't have an account? Register

      • Login or register to search.
      • First post
        Last post
      0
      • Categories
      • Recent
      • Tags
      • Popular
      • Users
      • Groups